Excitation of high-radial-order Laguerre–Gaussian modes in a solid-state laser using a lower-loss digitally controlled amplitude mask

Bell, Teboho; Hasnaoui, Abdelkrim; Aı̈t-Ameur, Kamel; Ngcobo, Sandile

doi:10.1088/2040-8986/aa81f9

Cited by 12 publications

(6 citation statements)

References 24 publications

(31 reference statements)

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“…There are several possibilities for improving the efficiency of selective laser melting with no loss in quality of the produced object during energy transformation from the laser source to the absorption of the energy during formation of the molten pool, mentioned in Table 1 [61,62]. The described possibilities have no visible effect on the improvement of process efficiency [63][64][65], except the last one, which can theoretically improve the efficiency by more than 2-3 times [66][67][68]. The knife-like formation of the molten pool, which is not as desirable for other technological laser applications as the precise laser cutting of thick sheets (with thickness more than 5 mm), laser scribing, and graving provoke multiple remelting of the material in the molten pool and interfusion with the previous layers due to its excess of energy on the treated surface.…”

Section: Classification Of the Main Slm Parameters And The Way Of Lasmentioning

confidence: 99%

Power Density Distribution for Laser Additive Manufacturing (SLM): Potential, Fundamentals and Advanced Applications

et al. 2018

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Problems with the laser additive manufacturing of metal parts related to its low efficiency are known to hamper its development and application. The method of selective laser melting of metallic powders can be improved by the installation of an additional laser beam modulator. This allows one to control the power density distribution optically in the laser beam, which can influence the character of heat and mass transfer in a molten pool during processing. The modulator contributes alternative modes of laser beam: Gaussian, flat top (top hat), and donut (bagel). The study of its influence includes a mathematical description and theoretical characterization of the modes, high-speed video monitoring and optical diagnostics, characterization of processing and the physical phenomena of selective laser melting, geometric characterization of single tracks, optical microscopy, and a discussion of the obtained dependences of the main selective laser melting (SLM) parameters and the field of its optimization. The single tracks were produced using the advanced technique of porosity lowering. The parameters of the obtained samples are presented in the form of 3D graphs. The further outlook and advanced applications are discussed.

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Section: Classification Of the Main Slm Parameters And The Way Of Lasmentioning

confidence: 99%

Power Density Distribution for Laser Additive Manufacturing (SLM): Potential, Fundamentals and Advanced Applications

et al. 2018

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“…In all cases, the amplitude masks introduce high loss on the zero field crossings of the desired mode so that only this mode experiences low loss. These systems have typically produced superpositions of azimuthal modes, radial modes, or combinations thereof, depending on the configuration of the amplitude mask. Multiple ring‐like amplitude structures have also been used to create Bessel beams and even flat‐top beams, the latter by allowing more than one mode to lase and weighting the superposition to be a flat‐top intensity structure.…”

Section: Structured Light Lasersmentioning

confidence: 99%

Structured Light from Lasers

Forbes

2019

Laser & Photonics Reviews

213

120

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Structured light is derived from the ability to tailor light, usually referring to the spatial control of its amplitude, phase, and polarization. Although a venerable topic that dates back to the very first laser designs, structuring light at the source has seen an explosion in activity over the past decade, fuelled by a modern toolkit that exploits the versatility of diffractive structures, liquid crystals, metasurfaces/metamaterials, and exotic laser geometries, as well as a myriad of applications that range from imaging, microscopy, and laser material processing to optical communication. Here, the recent progress in creating and controlling structured light is reviewed, with particular emphasis on structuring light at the source: structured light lasers. The various design approaches, including pump shaping, cavity geometries, and the use of custom intracavity optical elements, implemented in a variety of lasers from microchip solutions to high‐power fibers are covered in a tutorial style. The history and latest developments in the field are reviewed, elucidating the various structured light patterns that have been created from lasers, including orbital angular momentum and vector states of light. Finally, the present challenges and limitations are highlighted, along with comments on likely future trends.

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“…The study of structured light [31][32][33], beam shaping techniques [34][35][36][37] and metalenses [38,39] to conquer the limits of optical systems are enthusiastic research regimes. However, conventional lenses with a specially designed structure have high manufacturing costs and are limited by a lack of dynamic modulation characteristics.…”

Section: Introductionmentioning

confidence: 99%

Robust propagation of a steady optical beam through turbulence with extended depth of focus based on spatial light modulator

2023

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Finding appropriate strategies to increase the robustness to turbulence with extended depth of focus (DOF) is the common requirement in developing high-resolution imaging through air or water medium. However, the conventional lens with a specially designed structure requires high manufacturing costs and is limited by the lack of dynamic modulation characteristics. Spatial light modulator (SLM), the unique flat-panel optical device, can break through the distance limitation of beam propagation for the dynamic modulation property. In this work, we address the dynamic generation of the steady optical beam (STOB) based on the mechanism of transverse wave vector elimination. STOB generated by the SLM has significant advantages over Gaussian beams for the characteristics of peak intensity, robust propagation, extended-DOF beam profile, and dynamic wavefront modulation over a long distance under strong turbulent media. Our versatile, extensible, and flexible method has promising application scenarios for the realization of turbulence-resistant circumstances.

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Excitation of high-radial-order Laguerre–Gaussian modes in a solid-state laser using a lower-loss digitally controlled amplitude mask

Cited by 12 publications

References 24 publications

Power Density Distribution for Laser Additive Manufacturing (SLM): Potential, Fundamentals and Advanced Applications

Power Density Distribution for Laser Additive Manufacturing (SLM): Potential, Fundamentals and Advanced Applications

Structured Light from Lasers

Robust propagation of a steady optical beam through turbulence with extended depth of focus based on spatial light modulator

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